It's not a sample it's an interpolation, like eminem singing two trailer park girls go round the outside, or some of the bassline/hooks busta rhymes uses-http://www.whosampled.com/sample/view/38870/Busta%20Rhymes-Show%20Me%20What%20You%20Got_Central%20Line-Walking%20in%20to%20Sunshine/ for instance, They have heard the tune, and then made their tune based on it, the pitch, tempo, key, timing may be different but it is still there.In this case a few added notes here and there, but nothing to dramatically change it.

To Tick : What's the point to let "Sorry" in this category. We have to define what a sample is : it a part of an other previously released recording put in a new one, transformed or not. There is also no sample in "Sorry", just a clear inspiration. There's got to be an accuracy in the articles, otherwise it loses credibility. I'm not saying that because I'm a fan -and anyway, there is nothing bad at sampling if the result is good-, but again, writing "Sorry" samples "Can you feel it" is just not true!

While the bassline of "Sorry" was clearly inspired by "Can You Feel It", it is by no means a sample, neither a direct one or a replayed one.

I have to repeat what was already mentioned by sebastien.pradier: If it were a sample, it would have been credited. Throughout her career, Madonna has only sampled one song without crediting it, namely "El Yom 'Ulliqa 'Ala Khashaba" by Fairuz, which was sampled in both "Justify My Love (The Beast Within Remix)" and "Erotica".

There is no credit of any sample... cause there's no sample!!! If you listen carefully, you can not say that the bassline of "Sorry" is strictly the same as "Can You Feel It". It's an obvious inspiration but not a sample. Believe me, if it was a sample, it would be credited, don't worry!